Most airlines don’t charge to carry on a bag, but last month Allegiant Air began charging up to $35, depending on the route

Bag fees on other airlines also have been rising since USA Today surveyed all fees in September:

• Delta Air Lines’ highest fee then for a second checked bag was $75 for some international flights. Now the airline charges $80 for fliers paying online and $100 at the airport for flights between the U.S. and Europe or North Africa.

• American Airlines’ highest fee in September for a second checked bag was $60 on some international flights. Now the price is $70 for flights between the U.S. and…..